Despatch RFD1-42 -2E with Protocol 3 - Manual (Page 30)

T ROUBLESHOOTING RFD1-42-2E Oven Owner ’s Manual
30 Version 1
Copyright © 2012 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Table 3. Troubleshooting with Control Panel Mounted Circuit Board.
If LED is… Check…
1 LED 2LED 3 LED
Not Lit Check Fuse Block 2F and 3F (Figure 7)
Lit Not lit Lit 
Check High Limit

Check optional door switch, if appropriate
Lit Lit Lit

Check Fuse Block 1F and 4F (Figure 7)

Check SSR

Check heater

Check heater relays
Danger!
Electrical panels contain high voltage. Disconnect and lock out
the power supply before working inside any electrical panels.
Failure to lock out the power supply can result in death or injury.
7.2. Error Messages and Alarm
Table 4 lists the more common error messages, possible problems and remedies.
Table 4. Error Messages and Next Steps.
Alarm Status Possible Problem Next Step
HI LIMIT LED ON 
Problem with thermocouple

High Limit setpoint has been
exceeded
Once the problem has corrected,
press RESET.
DEV HOLD LED flashing Oven temperature has not
entered (or dropped out of) the
Auto Hold band and the soak
timer has stopped Program a slower ramp rate or, if
oven is not heating check heater
circuit.
Top PV displays OPEN Control thermocouple is
disconnected or broken Repair or replace the thermocouple.
HLPV displays OPEN High Limit thermocouple is
disconnected or broken Repair or replace the thermocouple.
Danger!
Table 3 lists troubleshooting steps that must be performed by a
qualified electrician or electrical technician trained on electrical
safety and the use of personal protective equipment.